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Memento: Implementation and Example

Explore how to implement the Memento design pattern in C#, focusing on creating immutable state snapshots with the Memento object. Learn how the Originator manages text state and how the Caretaker tracks history to restore previous states in a console application example.

We'll cover the following...

Implementing the Memento design pattern

After creating a project based on a console application template, we’ll add the following interface to it, which will represent the public methods available on the Memento object:

C#
namespace Memento_Demo;
internal interface IMemento 
{
  string GetState();
  DateTimeOffset GetCreatedDate();
}

The concrete Memento implementation will look as ...